The voltage in US is 110-120 volts and the amperage is 60 amps. In your country the voltage is 250 volts which appears to be high as the general voltage in Asian countries 220 volts and the current is 50 amps You have to use a transformer/adopter which can reduce the voltage from 250 to 220 Or it is a universal adopter where this aspect is covered up. In that case you have to check the amperage. 300 watt is the power consumed and has nothing to do with low/high voltage.
i used a 250v adapter, the engine is making noises and there were sparks occur at the speed controller. I'm wondering does this related to the adapter?
If it's metallic sound you are loosing teeth on a gear or two. This is caused by lack of lubricant or simply fatigue of the material of the gears.
Don't use it, you can get metal flakes in your food.
Take it in to a repair shop and have it fixed. The money spent is well worth it because if done correctly will last another few years.
Also get the speed control switch checked up. It is short circuiting thus giving sparks.
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